A portable gas fractionalization apparatus that provides oxygen rich air to patients is provided. The apparatus is compact, lightweight, and low-noise. The components are assembled in a housing that is divided into two compartments. One compartment is maintained at a lower temperature than the other compartment. The lower temperature compartment is configured for mounting components that can be damaged by heat. The higher temperature compartment is configured for mounting heat generating components. An air stream is directed to flow from an ambient air inlet to an air outlet constantly so that there is always a fresh source of cooling air. The apparatus utilizes a PSA unit to produce an oxygen enriched product. The PSA unit incorporates a novel single ended column design in which all flow paths and valves can be co-located on a single integrated manifold. The apparatus also can be used in conjunction with a satellite conserver and a mobility cart.
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15. An adsorbent bed column, comprising:
an elongated housing;
plural adsorbents positioned inside the housing; and
a first filter comprised of a fit positioned proximate one end of the housing adjacent at least one adsorbent, wherein the column further comprising a wave spring positioned against an exterior surface of the first filter so as to apply a substantially even pressure over the first filter.
11. A portable gas fractionalization apparatus, comprising:
a housing;
a compressor mount having an upper surface and an opening defined by said upper surface;
a compressor assembly mounted in the housing on said compressor mount, wherein a first portion of the compressor assembly rests on the upper surface of the compressor mount and a second portion of the compressor assembly extends into the opening and remains suspended therein.
5. A portable gas fractionalization apparatus, comprising:
plural adsorbent bed columns mounted side by side; and
an integrated fluid flow manifold mounted on one end of said columns and comprised of a plurality of integrated flow passages and a plurality of valves which control flow of fluid through said integrated flow passages to and from the columns, wherein said integrated fluid flow manifold comprises at least one piloted valve.
6. A portable gas fractionalization apparatus, comprising:
plural adsorbent bed columns mounted side by side; and
an integrated fluid flow manifold mounted on one end of said columns and comprised of a plurality of integrated flow passages and a plurality of valves which control flow of fluid through said integrated flow passages to and from the columns, wherein said integrated fluid flow manifold has a gravity water trap positioned therein.
1. A portable gas fractionalization apparatus, comprising:
plural adsorbent bed columns mounted side by side;
an integrated fluid flow manifold mounted on one end of said columns and comprised of a plurality of integrated flow passages and a plurality of valves which control flow of fluid through said integrated flow passages to and from the columns; and
a circuit board comprising circuitry which controls said valves, said manifold disposed between the circuit board and the one end of the columns.
7. A portable gas fractionalization apparatus, comprising:
a compressor which produces a feed gas;
plural adsorbent beds connected to receive the feed gas from the compressor via a fluid pathway, said beds providing a purified gas and a waste gas from said feed gas, said waste gas expelled from said beds via a waste gas pathway; and
a water trap which traps water condensed in said fluid pathway to prevent said water from reaching said beds, said water located in said waste gas pathway such that said expelled waste gas carries the water away from the beds.
2. The apparatus of
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1. Field of the Invention
This invention relates generally to a portable gas fractionalization system, more particularly, to a compact oxygen concentrator that is suitable for both in-home and ambulatory use so as to provide users greater ease of mobility.
2. Description of the Related Art
Patients who suffer from respiratory ailments such as Chronic Obstructive Pulmonary Diseases (COPD) often require prescribed doses of supplemental oxygen to increase the oxygen level in their blood. Supplemental oxygen is commonly supplied to the patients in metal cylinders containing compressed oxygen gas or liquid oxygen. Each cylinder contains only a finite amount of oxygen that typically lasts only a few hours. Thus, patients usually cannot leave home for any length of time unless they carry with them additional cylinders, which can be heavy and cumbersome. Patients who wish to travel often have to make arrangements with medical equipment providers to arrange for an exchange of cylinders at their destination or along the route, the inconvenience of which discourages many from taking extended trips away from home.
Supplemental oxygen can also be supplied by oxygen concentrators that produce oxygen concentrated air on a constant basis by filtering ambient air through a molecular sieve bed. While oxygen concentrators are effective at continual production of oxygen, they are typically large electrically powered, stationary units that generate high levels of noise, in the range of 50–55 db, which presents a constant source of noise pollution. Moreover, the units are too heavy to be easily transported for ambulatory use as they typically weigh between 35 to 55 lbs. Patients who use oxygen concentrators are thus tethered to the stationary machines and inhibited in their ability to lead an active life. While portable oxygen concentrators have been developed to provide patients with greater mobility, the currently commercially available portable concentrators do not necessarily provide patients with the ease of mobility that they desire. The portable concentrators tend to generate as much noise as the stationary units and thus cannot be used at places such as the theater or library where such noise is prohibited. Moreover, the present portable concentrators have very short battery life, typically less than one hour, and thus cannot be used continuously for any length of time without an external power source.
From the foregoing, it will be appreciated that there is a need for an apparatus and method that effectively provide supplemental oxygen to patients for both in-home and ambulatory use. To this end, there is a particular need for a portable oxygen concentrator that is lightweight, quiet, and can supply oxygen continuously for an extended period without requiring an external power source.
In one aspect, the preferred embodiments of the present invention provide a portable gas fractionalization apparatus comprising plural adsorbent bed columns mounted side by side and an integral fluid flow manifold mounted on one end of the columns and comprised of a plurality of integrated flow passages and a plurality of valves which control flow of fluid through the integrated flow passages to and from the columns. In one embodiment, the apparatus further comprises a circuit board having circuitry which controls the valves. The manifold is preferably disposed between the circuit board and the one end of the columns. Preferably, contacts on the circuit board are in direct electrical contact with mating contacts on the valves. In one embodiment, the integrated fluid flow manifold comprises at least one piloted valve. In another embodiment, the integrated fluid flow manifold comprises at least one water trap positioned therein. The adsorbent columns preferably comprise one or more feed tubes configured to direct fluid to flow from flow passages in the integrated manifold mounted on one end of the columns to an opening in the other end of the columns. In one embodiment, the integrated manifold comprises an upper plate and a lower plate, each plate is made of a plastic material.
In a second aspect, the preferred embodiments of the present invention provide a portable gas fractionalization apparatus comprising a compressor which produces a feed gas; plural adsorbent beds connected to receive the feed gas from the compressor via a feed gas pathway. The beds preferably provide a purified gas and a waste gas from the feed gas and the waste gas is expelled from the beds via a waste gas pathway. The apparatus further comprises a water trap which traps water condensed in the fluid pathway to prevent the water from reaching the beds. Preferably, the trapped water is located in the waste gas pathway such that the expelled waste gas carries the water away from the beds. In one embodiment, the water trap is positioned at a lower elevation relative to the feed gas pathway, wherein gravity causes the condensed water in the feed gas pathway to flow into the water trap located at the lower elevation. In another embodiment, the water trap is positioned in a laminated manifold, preferably in the center of a three way junction formed by airflow pathways to and from a feed valve, an exhaust valve, and a connection to an adsorbent bed.
In a third aspect, the preferred embodiments of the present invention provide a portable gas fractionalization apparatus comprising a housing, a compressor mounted in the housing on a vibration damping member, and a compressor restraint connected between the compressor and the housing and sufficiently elastically yieldable to non-rigidly fasten the compressor to the housing. In one embodiment, the vibration damping member comprises a grommet having a plurality of ribs formed thereon. In another embodiment, the compressor restraint comprises an elastic tether having elongated legs configured with pre-formed bends which extend away from each other. The bends preferably can be pressed toward each other to straighten the legs and increase the overall length of the compressor restraint so as to facilitate mounting and removal of the compressor restraint.
In a fourth aspect, the preferred embodiments of the present invention provide an adsorbent bed column comprising an elongated housing; an adsorbent material positioned inside the housing, and a first filter positioned proximate one end of the housing. The filter preferably comprises a generally annular member in sealing engagement with the housing, and a filter portion integrally formed as a single piece with the annular member. In one embodiment, the annular member comprises a silicone material and the filter portion comprises a woven fabric that is molded with the annular member. In another embodiment, the first filter is adapted to filter particulate greater than about 70 microns.
In a fifth aspect, the preferred embodiments of the present invention provide an adsorbent bed column comprising an elongated housing; plural adsorbents positioned inside the housing; and a first filter comprised of a frit positioned proximate one end of the housing adjacent at least one adsorbent. In one embodiment, the column further comprises a second filter comprised of a frit positioned proximate the other end of the housing adjacent at least one adsorbent. Preferably, the first and second filters each has a thickness of at least 0.2 inch so as to be sufficiently thick to substantially restrain movement of the adsorbents inside the housing. In another embodiment, the column further comprises a wave spring positioned against an exterior surface of the first filter so as to apply a substantially even pressure over the first filter.
Ambient air is drawn through the intake 102 at a relatively low flow rate, preferably no greater than about 15 standard liters per minute (slpm), so as to reduce noise due to airflow through the system. The system 100 further includes a fan 112 that produces an air stream across the compressor assembly 106 also preferably at a relatively low flow rate so as to provide cooling for the compressor assembly 106 without generating excessive noise.
As also shown in
The PSA unit 108 is configured to operate in accordance with a pressure swing adsorption (PSA) cycle to produce an oxygen enriched product gas from the feed gas. The general operating principles of PSA cycles are known and commonly used to selectively remove one or more components of a gas in various gas fractionalization devices such as oxygen concentrators. A typical PSA cycle entails cycling a valve system connected to at least two adsorbent beds such that a pressurized feed gas is sequentially directed into each adsorbent bed for selective adsorption of a component of the gas while waste gas from previous cycles is simultaneously purged from the adsorbent bed(s) that are not performing adsorption. Product gas with a higher concentration of the un-adsorbed component(s) is collected for use. Additional background information on PSA technology is described in U.S. Pat. No. 5,226,933, which is hereby incorporated by reference.
As shown in
Step 1: Pressurize-Adsorbent Bed 118a/Production-Adsorbent Bed 118b
Step 2: Feed-Adsorbent Bed 118a/Blowdown-Adsorbent Bed 118b
Step 3: Feed and Production-Adsorbent Bed 118a/Purge-Adsorbent Bed 118b
Step 4: Production-Adsorbent Bed 118a/Pressurize-Adsorbent Bed 118b
Step 5: Blowdown-Adsorbent Bed 118a/Feed-Adsorbent Bed 118b
Step 6: Purge-Adsorbent Bed 118a/Feed and Production-Adsorbent Bed 118b
The PSA cycle described above advantageously includes one or more pressure equalization steps (steps 1 and 4) in which already pressurized product gas is released from one adsorbent bed to provide initial pressurization for another adsorbent bed until the two beds have reached substantially the same pressure. The pressure equalization step leads to increased product recovery and lower power consumption because it captures the expansion energy in the product gas and uses it to pressurize other adsorbent beds, which in turn reduces the amount of power and feed gas required to pressurize each bed. In one embodiment, the two-bed PSA unit shown in
As
As shown in
Preferably, at least some of the above-described structures of the chassis 202 are integrally formed via an injection molding process so as to ensure dimensional accuracy and reduce assembly time. These pre-formed structures in the chassis advantageously facilitate assembly of the components and help stabilize the components once they are assembled in the housing. In one embodiment, the chassis serves the function of providing an intermediary vibration isolation to the compressor and motor. As shown in
As
As will be described in greater detail below, the integrated manifold 512 contains a plurality of integrated flow passages formed in a single plane that permit fluid to flow to and from the columns 508a–b, 510. The integrated manifold 512 also has a plurality of solenoid valves 514 positioned in a single plane that control the flow of the fluid to and from the columns 508a–b, 510 during a PSA cycle. As shown in
In one embodiment, an oxygen sensor 518 is mounted on the integrated manifold 512 and ported directly into a product gas flow passage in the manifold 512. The oxygen sensor 518 is configured to measure the oxygen concentration in the product gas using a galvanic cell or other known devices. Mounting the oxygen sensor 518 directly on the integrated manifold 512 results in a more compact assembly as it eliminates the use of tubing and connectors that are typically required to interconnect the oxygen sensor to the PSA unit. Moreover, it also places the oxygen sensor 518 closer to the product gas stream, which is likely to improve the accuracy and response time of the sensor. In another embodiment, a breath detector 520 is also ported into the integrated manifold 512. The breath detector 520 generally comprises one pressure transducer that senses pressure change in the product gas downstream of the product delivery valve (shown schematically in
Advantageously, the PSA unit 506 has many novel features which, individually and in combination, contribute to a lighter, more compact and reliable apparatus. As shown in
The feed tube 608 preferably has a relatively small internal diameter to substantially minimize head space. It is generally recognized that the feed passage in a PSA unit represents head space, which is undesirable as it penalizes system performance. In one embodiment, the feed tube 608 has an internal diameter of about 0.125 inch and the adsorbent housing 602 has a diameter of about 1.5 inch. Moreover, the adsorbent housing 602 and the feed tube 608 are preferably integrally formed in an extrusion process so as to eliminate the use of flexible tubing and reduce potential leakage. In certain embodiments, the adsorbent bed column 508a further includes a plurality of threaded mounting members 610 positioned adjacent the adsorbent housing 602 for mating with screws that attach the column 508a to the chassis and manifold. The threaded mounting members 610 are preferably co-extruded with the housing 602 and the feed tube 608 so as to simplify part construction.
As also shown in
As also shown in
In one embodiment, the water trap 902 is configured as a recess in the lower plate 804 of the manifold 512, extending downwardly from a section of the feed gas pathway 904 located in the upper plate 802. The water trap 902 is positioned at a lower elevation relative to the feed gas pathway 904 so as to substantially prevent trapped water 906 from re-entering the feed gas pathway 904. In certain embodiments, a baffle 912 is positioned in the feed gas pathway 904 to divert the feed gas flow downwardly into the water trap 902 so that the gas is required to rise upwardly to return to the feed gas pathway 904, which substantially prevents any condensed water from being carried past the water trap by the feed gas flow. As also shown in
In operation, feed gas 914 enters the manifold 512 through the feed gas inlet 812 in the upper plate 802 and is directed through a solenoid valve 816 into the feed gas pathway 904. The feed gas 914 flows across the recessed water trap 902 such that condensed water 906 in the feed gas 914 settles into the water trap 902 by gravity while the lighter components continue along the pathway 904 into the adsorbent bed 908. Preferably, the water trap 902 containing the condensed water 906 is subsequently purged by gas in the waste gas pathway 910. It will be appreciated that the integrated water trap system is not limited to the above-described embodiment. Any integrated water trap system that encompasses the general concept of forming an integrated gas flow path having a lower region where light air flows past and moisture air condenses due to gravity are contemplated to be within the scope of the invention.
As shown in
In one embodiment, the diaphragm 1006 is seated in a recess 1010 that extends downwardly from an exterior surface 1012 of the upper plate 802. An insert 1014 is mounted in the recess 1010 above the diaphragm 1006 and flush with the exterior surface 1012 of the plate 802. The diaphragm 1006 has an outer rim 1016 that sealingly engages with an inner surface 1018 of the insert 1014 so as to form the air chamber 1004 as shown in
As also shown in
In operation, pressurized purge gas 1028 from the adsorbent column flows into the opening 1022 in the upper plate 802 and pushes the diaphragm 1006 away from the baffle 1024 so as to open the path 1026 between the diaphragm 1006 and the baffle 1024 for gas flow. After the purge gas is released through the exhaust, a portion of the feed gas is directed into the air chamber 1004 via the solenoid valve 1002 to push the diaphragm against the baffle 1024 so as to close the path 1026 therebetween. Advantageously, the piloted valve system 1000 allows waste gas to be released from the column through a much larger opening than the orifices contained in the solenoid valves and does not consume additional space as the valves are all incorporated in the manifold.
As also shown in
In one embodiment, a compressor restraint 1122 is connected between the compressor 1108 and the chassis 202 to secure the compressor 1108 to the housing 206. Preferably, the compressor restraint 1122 comprises an elastic tether that fastens the compressor 1108 to the chassis. Preferably, the chassis is fit with grooves for engaging with the compressor restraint. In one embodiment, the compressor restraint 1122 comprises two elongated legs 1124a, 1124b spaced apart in the middle and joined together in an upper end 1126a and a lower end 1126b. The upper end 1126a is removably attached to the compressor 1108 and the lower end 1126b removably attached to the chassis 202. Moreover, the elongated legs 1124a, 1124b preferably have preformed bends which extend away from each other. These bends can be pressed toward each other to straighten the legs and increase the overall length of the compressor restraint 1122 so as to facilitate mounting and removal of the compressor restraint. Preferably, the compressor restraint does not substantially exert active force on the compressor assembly when the housing is in its upright position so as to reduce vibration coupling from the compressor to the chassis.
In another embodiment, a vibration damping member 1128 is interposed between the compressor mount 406 and the compressor 1108 to further reduce transfer of vibrational energy from the compressor to the housing. As shown in
In addition to vibration control features, the apparatus also incorporates one or more thermal management systems to provide cooling for temperature sensitive components inside the housing and facilitate heat dissipation.
In one embodiment, a conduit 1306 extends from the exhaust outlet 814 of the PSA unit 506 to an opening 1038 in the battery slot 412. The conduit 1306 directs exhaust gas 1312 from the PSA unit 506 into the space between the thermal sleeve 1302 and the battery 1104. Since the exhaust gas is typically cooler than ambient air surrounding the battery compartment, it serves as an efficient source of cooling air for the battery. The exhaust gas enters the thermal sleeve 1302 from the lower opening 1308 in the battery slot 412 and circulates out of the upper end 1310 of the thermal sleeve 1302.
As also shown in
As will be described in greater detail below, the circuit board 1314 is located in the path of a directed air flow inside the housing so as to facilitate heat dissipation of the circuits during operation. Moreover, although the control circuitry is substantially entirely within the first compartment 300, the circuit board 1314 extends horizontally from the first compartment 300 to the second compartment 302, substantially covering the upper openings of both compartments so as to inhibit migration of higher temperature air from the second compartment 302 into the first 300. In one embodiment, foam material is placed between the outer edges 1316 of the circuit board 1314 and the inner walls of the housing to form an air seal which further inhibits migration of air between the compartments 300, 302. In another embodiment, the circuit board 1314 is shaped to mirror the cross-sectional contour of the housing so as to ensure an effective seal between the circuit board 1314 and housing.
In one embodiment, the air flow passageway 1406 has an upstream portion 1408 and a downstream portion 1410. The upstream portion 1408 includes a vertical path 1406a generally defined by the PSA unit 506 and the sidewall 212c of the housing 206 followed by a horizontal path 1406b generally defined by the circuit board 1314 and the upper wall 210. The downstream portion 1410 includes a vertical path 1410a generally defined by the partition 304 and the battery 1104, a horizontal path 1410b generally defined by the compressor assembly 1106 and the base 208 of the housing, and followed by another vertical path 1410c defined by the battery 1104 and the sidewall 212a. Air in the upstream portion 1408 of the passageway 1406 preferably has a lower temperature than air in the downstream portion 1420 where most heat generating components are located. Temperature sensitive components such as the valves 514 and electrical components disposed on the circuit board 1314 are advantageously disposed in the upstream portion 1408, thereby exposing the valves and components to a continuous stream of incoming cooling air, which reduces their thermal load. Preferably, the upstream portion 1408 of the air flow passageway 1406 is thermally isolated from the downstream portion 1410 by the partition 304 and the circuit board 1314 in conjunction with a directed air flow described below.
As also shown in
In certain embodiments, noise reduction features are also implemented in the apparatus. As shown in
As also shown in
As shown in
The satellite conserver 1700 is configured to substantially remove the constraint imposed by the short tube requirement and allow users the freedom to move in a much larger area around the portable concentrator. As shown in
As also shown in
As also shown in
Although the foregoing description of certain preferred embodiments of the present invention has shown, described and pointed out the fundamental novel features of the invention, it will be understood that various omissions, substitutions, and changes in the form of the detail of the system, apparatus, and methods as illustrated as well as the uses thereof, may be made by those skilled in the art, without departing from the spirit of the invention. Consequently, the scope of the present invention should not be limited to the foregoing discussions.
Bare, Rex O., Deane, Geoffrey Frank, Taylor, Brenton Alan, Sargent, Bradley J., Scherer, Andrew J.
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